Mobile wood crusher

ABSTRACT

A movable wood crushing machine according to the present invention comprises a vehicle body  2  with a travel device provided therein; a rotary crushing device  6  provided at an edge of this vehicle body in the traveling direction for crushing the wood into wood chips; a tab-type feeder  7  provided on this rotary crushing device with an charging opening for charging wood to be crushed formed in an upper section thereof; a conveyer  4  extending from a position under the rotary crushing device  6  in the traveling direction of the vehicle body toward the other edge section of the vehicle body in the traveling direction for transferring and discharging wood chips crushed by the rotary crushing device  6  to the outside; and a drive unit  5  provided between the rotary crushing device  6  and the conveyer  4  for driving drive sources for the travel device  3 , the rotary crushing device  6 , the tab-type feeder  7 , and the conveyer  4.

TECHNICAL FIELD

The present invention relates to a movable wood crushing machine forcrushing charged wood to produce chip-like crushed pieces of wood.

BACKGROUND ART

For the purpose to recycle trees or tree branches felled from forests asfertilizers for organic farming and the like, or for suppressing atransportation cost by reducing a transport capacity when waste woodfrom deserted or broken houses is transported with an auto truck, a woodcrushing machine capable of crushing the trees and waste woods intochips is often used.

As a movable wood crushing machine based on the conventional technology,for instance, that described in Patent Document 1 is well known.

A movable wood crushing machine 100 based on the conventional technologyas described above comprises, for instance, a vehicle body 110, acrawler type travel device 120, an engine 130, a hydraulic motor 140, atab-type feeder 150, and a conveyer 160 as a carrying device.

Further, as shown in FIG. 40, a rotary crushing device 170 is providedjust under the tab-type feeder 150. Further a scattering preventioncover 180 is provided above the tab-type feeder 150.

The vehicle body 110 comprises a steel-made frame supporting the engine130, hydraulic motor 140, tab-type feeder 150, conveyer 160 and rotarycrushing device 170, and the crawler type travel devices 120 areprovided at both edges of the lower part of vehicle body 110respectively, and when the crawler type travel devices 120 are driven,the vehicle body 110 runs.

The engine 130 is positioned at an edge section of the vehicle body 110in the traveling direction, and a cooling fan 131 and a radiator 132 areprovided at positions adjacent to the engine 130 in a directionperpendicular to the traveling direction, and an outer side of theradiator 132 is covered with a net 133.

In the side opposite to the cooling fan 131 and radiator 132, ahydraulic pump 134 is provided at a position adjacent to the engine 130,and this hydraulic pump 134 is connected via an oil-feeding pipe 135 tothe hydraulic motor 140.

Provided on a side face of the vehicle body 110 with the hydraulic pump134 is an operation panel 136 for controlling the engine 130, hydraulicpump 134, hydraulic motor 140 and the like.

A plurality of hydraulic motors 140 (not shown in FIG. 40) are providedin accordance with driven sections of the movable wood crushing machine100 in addition to that connected to a rotary crushing device 170, andmore specifically, in addition to that for the rotary crushing device170 shown in FIG. 40, the hydraulic motors 140 are provided for thecrawler type travel device 120, tab-type feeder 150, and conveyer 160respectively.

The tab-type feeder 150 is provided at a substantially central portionof the vehicle body 110, and comprises a base plate 151 provided on thevehicle body 110, and a cylindrical body 152 rotatably provided on thisbase plate 151. At a position corresponding to the e rotary crushingdevice 170, an opening 153 is formed on the base plate 151, and when thecylindrical body 152 rotates in the direction as indicated by the arrowin FIG. 40, charged wood is guided to the opening 153 being agitated.

The conveyer 160 is provided in the contrary side from the engine 130with the tab-type feeder 150 sandwiched therebetween, and an edgesection thereof extends downward from the rotary crushing device 170.This conveyer 160 transfers the wood chips crushed by rotary crushingdevice 170 along the direction in which the movable wood crushingmachine 100 travels to discharge the wood chips to the outside.

The rotary crushing device 170 comprises a rotary shaft connected to thehydraulic motor 140, a rotary drum provided around this rotary shaft androtating in association with rotation of the rotary shaft, and aplurality of bits embedded on an external peripheral surface of therotary drum, and when the rotary shaft is rotated by the hydraulic motor140, the rotary drum rotates in the direction indicated by the arrow inFIG. 40. A screen is provided between this rotary crushing device 170and the conveyer 160.

When wood chips is produced from wood with the movable wood crushingmachine 100 as described above, at first, in the state where thetab-type feeder 150, conveyer 160, and rotary crushing device 170 arebeing rotated, wood is charged by a loader PC or the like into therotary crushing device 170. The charged wood is rotated inside thetab-type feeder 150 and guided to the opening 153 to be crushed by therotary crushing device 170.

When the wood chips are crushed by the rotary crushing device 170 tothose each having a prespecified size or below, the wood chips aredropped via the screen onto the conveyer 160, and are discharged by theconveyer 160 to the outside.

When wood is crushed by the movable wood crushing machine 100 based onthe conventional technology as described above, the rotary crushingdevice 170 must be cleaned periodically.

In this case, cleaning is performed after operations of the movable woodcrushing machine 100 are stopped, but cleaning is difficult unless thetab-type feeder 150 is removed.

To solve this problem, as shown in FIG. 41, a swinging mechanism 190 forswinging the tab-type feeder 150 by 90 degrees in the lateral direction(in the direction perpendicular to the traveling direction) of thevehicle body 110 is provided under the tab-type feeder 150 mounted onthe vehicle body 110 with the crawler type travel device 120 providedthereon (Refer to, for instance, Patent Document 2).

This swinging mechanism 190 comprises a coupling shaft 191 for pivotablysupporting the tab-type feeder 150 on the vehicle body 110 and ahydraulic cylinder 192.

The hydraulic cylinder 192 is a member for coupling the vehicle body 110to the base plate 151, and when the tab-type feeder 150 is swung by 90degrees, this hydraulic cylinder 192 extends.

A hydraulic cylinder 193 is a member for coupling the tab-type feeder150 and scattering prevention cover 180 to each other, and when wood iscrushed, the hydraulic cylinder 193 extends so that an upper opening ofthe tab-type feeder 150 is covered with the scattering prevention cover180, and during the swinging operation, the hydraulic cylinder 193shrinks with the scattering prevention cover 180 positioned along a sideface of the tab-type feeder 150, so that the scattering prevention cover180 does not spring out in the lateral direction in the swingingposture.

[Patent Document 1]

Japanese Patent Laid-Open Publication No. 2001-9318 (page 4, FIG. 1)

[Patent Document 2]

Japanese Patent Laid-Open Publication No. 2000-15128 (page 4, page 5,FIG. 1, FIG. 7)

DISCLOSURE OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

With the movable wood crushing machine 100 based on the conventionaltechnology as described above, however, there occur the followingproblems.

(1) As the conveyer 160 is provided at a position adjacent to thetab-type feeder 150 and rotary crushing device 170 each provided at acentral portion of the vehicle body 110, chipped wood pieces crushed bythe rotary crushing device 170 scatter from the tab-type feeder 150 andsometimes are mixed through the screen in wood chips each having adesired size being carried onto the conveyer 160, which makes itdifficult to uniform a size of produced wood chips.

(2) As shown in FIG. 40, when wood is charged by a loader PC into thetab-type feeder 150, usually the loader PC is positioned at a positionother than that in the direction indicated by the white arrow mark inFIG. 40 in which crushed wood chips spatter. However, an operator of theloader PC can visually check a charging opening of the tab-type feeder150 and various monitor display sections on an operation panel 136 fromthe position of the loader PC, but can not visually check a net 133covering the radiator 132 and the like because the components areprovided in the contrary side from the loader PC. Due to thecharacteristics of the movable wood crushing machine 100, sometimes finewood waste is absorbed by the cooling fan 131 and deposited on the net133, which may in turn cause over heating, and therefore the operator isrequired to visually check clogging of the net 133 during the work. Forvisually check clogging of the net 133, the operator must get off fromthe loader PC and goes to the contrary side for checking, whichdisadvantageously lowers the operator's work efficiency.

(3) The tab-type feeder 150 of the movable wood crushing machine 100 ispositioned at a substantially central portion of the vehicle body 110between the engine 130 and the conveyer 160, and therefore when thetab-type feeder 150 is swung for cleaning, wood pieces in the tab-typefeeder 150 overflow to the outside, and the wood pieces hamper thecleaning work. So cleaning is performed after the movable wood crushingmachine 100 is removed, but when the movable wood crushing machine 100is removed in the state where the tab-type feeder 150 is being swung, asthe tab-type feeder 150 is supported only with the hydraulic cylinder192, the force generated by swinging is required to be coped with thecoupling shaft 191 during travel, which may give damages to the couplingshaft.

It is an object of the present invention to provide a movable woodcrushing machine enabling production of wood chips with uniform size,easy visual check of the operating state of the movable crushing machineduring the work with a loader, and efficient cleaning work withoutapplying any additional work loaded to the machine during the cleaningwork.

MEANS FOR SOLVING THE PROBLEMS

In the present invention, the object described above is achieved bychanging the array of a rotary crushing device, a tab-type feeder, aconveyer, and a drive unit of a movable wood crushing machine.

Specifically, the movable wood crushing machine according to claim 1 forthe present invention is a movable wood crushing machine for producingwood chips by crushing wood charged therein and comprises: a vehiclebody provided with a travel device for traveling; a rotary crushingdevice provided at one edge of this vehicle body in the travelingdirection for crushing the wood into wood chips; a tab-type feederhaving a rotary tab rotatably provided on this rotary crushing devicewith an charging opening for charging wood to be crushed formed in upperpart thereof; a conveyer extending from a position under the rotarycrushing device toward the other edge of the vehicle body in thetraveling direction for transferring and discharging wood chips crushedby the rotary crushing device to the outside; and a drive unit providedbetween the rotary crushing device and the conveyer for driving drivesources for the travel device, the rotary crushing device, the tab-typefeeder, and the conveyer.

The movable wood crushing machine according to claim 2 for the presentinvention is characterized in that, in the movable wood crushing machineaccording to claim 1, the rotary crushing device is provided at aposition adjacent to the drive unit; and the tab-type feeder has ascattering prevention cover provided at a position corresponding to theposition of the rotary crushing device for covering the chargingopening.

The movable wood crushing machine according to claim 3 for the presentinvention is characterized in that, in the movable wood crushing machineaccording to claim 2, an opening for feeding wood to the rotary crushingdevice is formed at a bottom section of the tab-type feeder; and thescattering prevention cover is provided at a position covering theopening when viewed from the top.

The movable wood crushing machined according to claim 4 for the presentinvention is characterized in that, in the movable wood crushing machineaccording to claim 2 or claim 3, the scattering prevention cover extendsfrom an edge section of a the charging opening of the tab-type feeder onthe side closer to the drive unit in the traveling direction toward anedge section in the lateral direction perpendicular to the travelingdirection.

The movable wood crushing machine according to claim 5 for the presentinvention is characterized in that, in the movable wood crushing machineaccording to any of claims 1 to 4, an operation panel for driving andoperating various devices including the drive unit is provided on a sideface in the lateral direction perpendicular to the traveling directionof the vehicle body; a cooling air inlet section for the drive unit isformed on the side face with the operation panel provided thereon; andthis cooling air inlet section is covered with a covering deviceallowing visual check of clogging on the surface thereof.

The movable wood crushing machine according to claim 6 for the presentinvention is characterized in that, in the movable wood crushing machineaccording to any of claims 1 to 5, the vehicle body is provided with aswinging mechanism for swinging the tab-type feeder toward edge sectionsin the traveling direction of the vehicle body.

The movable wood crushing machine according to claim 7 for the presentinvention is characterized in that, in the movable wood crushing machineaccording to claim 6, the swinging mechanism has a coupling shaftswingablly bearing the tab-type feeder on the vehicle body; and when thetab-type feeder is in a posture for working, the horizontal distancefrom the center of the coupling shaft to an edge section of the tab-typefeeder on the side closer to the drive unit along the travelingdirection of the vehicle body is shorter than the vertical distance fromthe center of the coupling shaft to the final (translator's comment:“final” was a scribal error for “highest”) part of the tab-type feeder.

The movable wood crushing machine according to claim 8 for the presentinvention is characterized in that, in the movable wood crushing machineaccording to claim 7, when the tab-type feeder is in a posture forworking, the horizontal distance from the center of the coupling shaftto an edge section of the tab-type feeder on the contrary side from thedrive unit along the traveling direction of the vehicle body is shorterthan the vertical direction from the center of the coupling shaft to aposition of the travel device contacting the ground surface.

The movable wood crushing machine according to claim 9 for the presentinvention is characterized in that, in the movable wood crushing machineaccording to any of claims 5 to 7, the tab-type feeder comprises: a baseplate fixed on the vehicle body; a rotary tab rotatably provided on thisbase plate; and a hopper provided in the upper part of the rotary taband supported by a column erected from the base plate.

The movable wood crushing machine according to claim 10 for the presentinvention is characterized in that, in the movable wood crushing machineaccording to any of claims 6 to 9, the swinging mechanism has a swingingrestricting section for inhibiting a swinging movement of the tab-typefeeder up to a position causing interference to the travel device whenthe tab-type feeder is rotated swung the coupling shaft.

The wood crushing machine according to claim 11 for the presentinvention is characterized in that, in the movable wood crushing machineaccording to any of claims 1 to 10, a screen member allowing passingthrough only the wood chips crushed by the rotary crushing device havinga prespecified size or below is provided between the rotary crushingdevice and the conveyer; and this screen member is provided around arotary shaft of the rotary crushing device to surround the rotarycrushing device with an upper edge thereof provided at a position higherthan the rotary shaft of the rotary crushing device when viewed from aposition of the rotary shaft.

EFFECT OF THE INVENTION

With the movable wood crushing machine according to claim 1, a driveunit is provided between the rotary crushing device and tab-type feederand the conveyer, even if wood chips scatter from a charging opening ofthe tab-type feeder for charging wood, the scattered wood chips arenever mixed with those on the conveyer, so that wood chips each with auniform size can be produced.

Further, the rotary crushing device and tab-type feeder are provided inone side of the vehicle body, so that charging wood with a loader can becarried out from an edge section of the movable wood crushing machine inthe traveling direction or from a side face section in the lateraldirection, so that a position for charging wood can be changed accordingto the situation at the site, which ensures substantial improvement inthe work efficiency.

Further the drive unit is provided at a substantially central position,and the rotary crushing device, tab-type feeder, and conveyer areprovided around the drive unit, so that a transfer path of a drivingforce to drive sources for these devices from the drive unit can beshortened, so that delivery of a driving force can be carried outefficiently.

With the movable wood crushing machine according to claim 2, ascattering prevention cover is provided at a position corresponding to aposition of the rotary crushing device, so that, even when wood piecesnot having been crushed scatter from the charging opening for chargingwood, the wood pieces are prevented from being scattered to the outsidewith this scattering prevention cover.

With the movable wood crushing machine according to claim 3, thescattering prevention cover is provided at a position covering anopening of the tab-type feeder for feeding wood when viewed from thetop, so that wood pieces not having been crushed are prevented frombeing scattered to the outside more securely.

With the movable wood crushing machine according to claim 4, thescattering prevention cover extends from an edge section of the chargingopening of the tab-type feeder on the side closer to the drive unitalong the traveling direction toward an edge section in the lateraldirection perpendicular to the traveling direction, so that thescattering prevention cover does not cause any trouble for charging woodwith a loader from a side face or in the traveling direction, andtherefore the work efficiency in wood charging is not spoiled and theeffect of scattering prevention can be obtained.

With the movable wood crushing machine according to claim 5, theoperation panel for operations of the drive unit and the like and thecooling air inlet section are provided in the same side of the movablewood crushing machine, and the cooling air inlet section is covered witha covering unit allowing visual check of clogging on the surface, sothat, when performing the work for charging wood from this side, anoperator can perform it visually checking the state of the operationpanel or the cooling air inlet section, and therefore the workefficiency is not lowered by the need for checking and the like.

With the movable wood crushing machine according to claim 6, as theswinging mechanism is provided on the vehicle body and the tab-typefeeder can be swung toward edge sections in the traveling direction ofthe vehicle body, so that the cleaning work for the rotary crushingdevice can be performed from either side of the movable wood crushingmachine, and therefore the cleaning work can easily be performed.Further when wood inside the tab-type feeder is discharged to theoutside during the swinging operation, scattering of wood to the sidefaces in the lateral direction never occurs, and therefore the cleaningwork can be performed without the need of removing the movable woodcrushing machine.

With the movable wood crushing machine according to claim 7, by swingingthe tab-type feeder at a position of the coupling shaft as describedabove, when the tab-type feeder is swung and set in the verticalposture, the upper part can be positioned at a lower level as comparedto the height of the tab-type feeder in the working posture, andtherefore when the movable wood crushing machine is transported with atrailer or the like, by swinging and setting the tab-type feeder in thevertical posture, advantageous conditions are provided for restrictionsover transportation with a trailer or the like.

With the movable wood crushing machine according to claim 8, by swingingthe tab-type feeder at a position of the coupling shaft as describedabove, when the tab-type feeder is swung and set in the verticalposture, interference between the tab-type feeder and the ground surfacecan be prevented, and therefore movement with the traveling device ispossible even in the state.

With the movable wood crushing machine according to claim 9, the hopperis fixed on the base plate, and the rotary tab under the hopper rotates,so that wood can be charged with a loader into the fixed hopper, so thatthe work efficiency in charging wood is improved.

With the movable wood crushing machine according to claim 10, theswinging mechanism has a swinging restricting section, so thatinterference to the traveling device never occurs even when the tab-typefeeder is set in the vertical posture, and therefore the movable woodcrushing machine can be moved with the tab-type feeder kept in thevertical posture, so that handling of the movable wood crushing machinecan make easier.

With the movable wood crushing machine according to claim 11, the screenmember is positioned above and covers the rotary shaft of the rotarycrushing device, so that wood pieces not having been crushed never dropfrom an upper edge of the screen, nor are mixed in the crushed woodpieces having passed through the screen member, so that size of woodchips is uniformed and a quality of wood chips as a product can furtherbe improved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view showing a movable wood crushing machine accordingto an embodiment of the present invention;

FIG. 2 is a plan view showing the movable wood crushing machineaccording to the embodiment above;

FIG. 3 is a rear view showing the movable wood crushing machineaccording to the embodiment above;

FIG. 4 is a schematic plan view showing a drive unit in the embodimentabove;

FIG. 5 is a side view showing a drive unit according to the embodiment;

FIG. 6 is a plan view showing a rotary crushing device in theembodiment;

FIG. 7 is a side view showing the rotary crushing device;

FIG. 8 is a rear view showing the rotary crushing device,

FIG. 9 is a cross-sectional plan view showing a relation between atab-type feeder and a rotary mechanism in the embodiment above;

FIG. 10A is a simplified cross-sectional plan view of a rotary tab inthe embodiment;

FIG. 10B is an enlarged cross-sectional view showing a key section ofthe rotary tab in the embodiment;

FIG. 11 is a front view showing the rotary tab in the embodiment;

FIG. 12 is a cross-sectional front view showing the rotary tab in theembodiment;

FIG. 13 is a cross-sectional view showing a horizontal roller forguiding rotation of the rotary tab in the embodiment;

FIG. 14 is a cross-sectional view showing a vertical roller forreceiving the rotary tab in the embodiment;

FIG. 15 is an enlarged plan view showing a tab rotary mechanism in theembodiment;

FIG. 16 is an enlarged view showing a drive source for the tab rotarymechanism in the embodiment;

FIG. 17 is a cross-sectional view showing engagement between a chainconstituting the tab rotary mechanism and a sprocket provided in therotary tab in the embodiment;

FIG. 18 is a cross-sectional view showing a relation between a tabdriving chain and a guide member in the embodiment;

FIG. 19 is a cross-sectional view showing a key section of a tab drivingchain tension loading mechanism in the embodiment;

FIG. 20 is an enlarged view showing a key section of a tension loadingmechanism for loading a tension to the tab driving chain in theembodiment;

FIG. 21 is a side view showing a relation between the rotary tab and ahopper in the embodiment;

FIG. 22 is a front view showing the hopper in the embodiment;

FIG. 23 is a plan view showing the hopper in the embodiment;

FIG. 24 is a view showing the state shown in FIG. 21 (translator'scomment: “21” was a scribal error for “22”) in the direction indicatedby an arrow mark Z;

FIG. 25 is a bottom view showing the hopper in the embodiment;

FIG. 26 is a cross-sectional view taken along the line V-V in FIG. 21;

FIG. 27 is an enlarged cross-sectional view showing the mounting stateof a cover member in the embodiment;

FIG. 28 is a side view showing a structure of a tab swinging mechanismin the embodiment;

FIG. 29 is a plan view showing a structure of the tab swinging mechanismin the embodiment;

FIG. 30 is a rear view showing a structure of the tab swinging mechanismin the embodiment;

FIG. 31 is a side view showing a structure of a bracket constituting thetab swinging mechanism in the embodiment;

FIG. 32 is a view showing the state shown in FIG. 31 when viewed in thedirection indicated by the arrow mark R;

FIG. 33 is a view showing the state shown in FIG. 31 when viewed in thedirection indicated by the arrow mark L;

FIG. 34 is a schematic view for illustrating actions of the movable woodcrushing machine according to the embodiment;

FIG. 35 is a schematic view for illustrating reflection of crushedmatters by the scattering prevention cover in the embodiment;

FIG. 36 is a schematic view for illustrating scattering directions whencrushed matters are scattered from the rotary crushing device in theembodiment;

FIG. 37 is a schematic view for illustrating actions of the swingingmechanism in the embodiment;

FIG. 38 is a schematic view for illustrating actions of the swingingmechanism in the embodiment;

FIG. 39 is a side view showing a structure of a movable wood crushingmachine based on the conventional technology;

FIG. 40 is a schematic view for illustrating actions of the movable woodcrushing machine based on the conventional technology; and

FIG. 41 is a schematic view for illustrating actions of the swingingmechanism of the movable wood crushing machine based on the conventionaltechnology.

EXPLANATION OF CODES

-   1: Movable wood crushing machine-   2: Vehicle body-   3: Travel device-   3A, 6A, 7A: Motor (Drive source)-   4: Conveyer (Carrier)-   5: Drive unit-   6: Rotary crushing device-   7: Tab-type feeder-   8: Swinging mechanism-   56 (translator's comment: “56” was a scribal error for “57”):    Operation panel-   57 (translator's comment: “57” was a scribal error for “58”): Net    (Covering device)-   63: Screen member-   71: Tab receiving frame (Base plate)-   72: Rotary tab-   74: Hopper-   75: Scattering prevention cover-   76: charging opening-   83: Coupling shaft-   85: Swinging posture stopper (Swinging restricting section)-   635: Opening peripheral section (upper edge of the screen member)-   711: Opening-   A: Horizontal distance between a coupling shaft of the tab-type    feeder and an edge in the side thereof closer to the drive unit-   B: Vertical distance from the coupling shaft of the tab-type feeder    to the final (translator's comment: “final” was a scribal error for    “highest”) section-   C: Horizontal distance from the coupling shaft of the tab-type    feeder to an edge in the rear side-   D: Vertical distance from the coupling shaft of the tab-type feeder    to the mounting surface-   O2: Rotary shaft-   WD: Wood to be crushed

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention is described below with referenceto the related drawings.

(1) General Configuration

FIG. 1 to FIG. 3 show a movable wood crushing machine 1 according to anembodiment of the present invention. This movable wood crushing machine1 comprises a vehicle body 2, a travel device 3, a conveyer 4 as acarrier, a drive unit 5, a rotary crushing device 6, and a tab-typefeeder 7, and when wood is charged to the tab-type feeder 7, the wood iscrushed with the rotary crushing device 6 and the crushed wood piecesare discharged with the conveyer 4 to the outside.

The vehicle body 2 comprising a steel-made frame body supports theconveyer 4, drive unit 5, rotary crushing device 6, and tab-type feeder7 respectively. It is to be noted that the tab-type feeder 7 issupported via a swinging mechanism 8 provided on the vehicle body 2, andan external surface of the tab-type feeder 7 is covered with a feedercover 21.

Provided on the vehicle body 2 is the tab-type feeder 7 at one edge sidein the traveling direction (in the horizontal direction in FIG. 1) ofthe travel device 3, while the conveyer 4 is provided at the other edgeside, and the drive unit 5 is provided between the components. In thefollowing description, the traveling direction in which the movable woodcrushing machine 1 moves toward the conveyer 4 is described as travelingdirection, and the direction in which the movable wood crushing machine1 moves toward the tab-type feeder 7 is described as backward direction.

The travel device 3 is a crawler type travel device provided in each ofthe two sides under the vehicle body 2, and comprises a pair of drivingwheels 31 provided in side face edge sections of the vehicle body 2, andan endless track belt 32 wounded around the driving wheels 31 andcontacting the ground surface. The endless track belt 32 is formed bycoupling a plurality of track plates each with a projection provided onan outer surface thereof with pins or the like, and when a pair of thedriving wheels 31 are rotated, the endless track belt 32 rotates to movethe movable wood crushing machine 1.

The conveyer 4 comprises a first conveyer 41 extending diagonally upwardfrom a central lower position of an edge face of the vehicle body 2 inthe traveling direction and a second conveyer 42 (Refer to FIG. 3)extending downward to the rotary crushing device 6 between a pair oftravel devices 3 provided under the vehicle body 2.

The drive unit 5 is a portion for driving drive sources for the traveldevice 3, conveyer 4, rotary crushing device 6, and tab-type feeder 7,and comprises an engine driven with a fuel oil such as light oil, anhydraulic pump driven by the engine, and a hydraulic pressure feed pathfor feeding oil from the hydraulic pump to hydraulic motors as drivesources for the components.

The rotary crushing device 6 is a device for crushing wood supplied tothe tab-type feeder 7, and comprises a rotary shaft rotated by thehydraulic motor as a drive source, a rotary drum provided around thisrotary shaft, and a plurality of bits embedded on an external peripheralsurface of this rotary drum.

The tab-type feeder 7 feeds wood charged by a loader to the rotarycrushing device 6, and comprises a rotary tab 72 rotatably supported onand by a tab receiving frame 71 as a base plate, a hopper 74 provided onthis rotary tab 72 via a column 73, and a scattering prevention cover 75provided above this hopper 74. A portion of the hopper 74 in which thescattering prevention cover 75 is not provided is a charging opening 76for charging wood.

Structures of the drive unit 5, rotary crushing device 6, and tab-typefeeder 7 in the movable wood crushing machine 1 described above aredescribed in detail below.

[2] Structure of the Drive Unit 5

FIG. 4 and FIG. 5 each show a schematic structure of the drive unit 5provided at a substantially central portion of the movable wood crushingmachine 1.

This drive unit 5 comprises an engine 51, a fuel oil tank 52, a battery53, a hydraulic pump 54, a hydraulic oil tank 55, an operating valve 56,and an operation panel 57, and drives the hydraulic pump 54 with theengine 51 as a power source, and drives the components by feeding ahydraulic oil to the hydraulic motors from the operating valve 56.

The engine 51 comprises an engine body 511 such as a diesel engine, aradiator 512 for cooling this engine body 511, an oil cooler 513, and afan 514.

Connected to this engine 51 are the fuel oil tank 52 via a fuel feedpipe (not shown), and the battery 53 via electric wiring, and when afuel is fed from the fuel oil tank 52, the engine 51 starts driving withthe battery 53.

Further a cooling air inlet port is provided on a side face of themovable wood crushing machine 1 on which the radiator 512 and oil cooler513 are provided and this opening is covered with a net 58 as a coveringdevice.

The hydraulic pump 54 functions as a hydraulic oil feeder driven by theengine 51, and feeds hydraulic oil inside the hydraulic oil tank 55 whendriven by the engine 51 with a prespecified pressure to the operatingvalve 56.

The operating valve 56 supplies the hydraulic oil from the hydraulicpump 54 to each of the hydraulic motors provided in the travel device 3,conveyer 4, rotary crushing device 6, and tab-type feeder 7 selectingeach according to the necessity, and comprises a valve body 561 andpiping paths 562 to 566.

Specifically the piping path 562 is used for feeding hydraulic oil fromthe valve body 561 to a mill motor 6A for driving the rotary crushingdevice 6, the piping path 563 is used for feeding hydraulic oil to a tabmotor 7A for driving the tab-type feeder 7, piping path 564 is used forfeeding hydraulic oil to a conveyer motor 4A for driving the conveyer 4,piping path 565 is used for feeding hydraulic oil to a travel motor 3Afor driving the travel device 3, and piping path 566 is provided underthe fan 514 as shown in FIG. 5, and is used for feeding hydraulic oil toa fan-driving motor 51A coupled to this fan 514 with a V belt or thelike.

The operation panel 57 is a section for switching the operating valve 56according to an input by an operator for providing controls such asstaring or stopping an operation of the engine 51, and comprises anoperation panel 571 exposed on a side face of the movable wood crushingmachine 1 and a controller body 572 provided inside this operation panel571.

The operation panel 571 has, in addition to switches used by an operatorfor starting or stopping operations, operating state display lamps fordisplaying the operating state, and indicators for indicating whethereach of the hydraulic motors is in the overloaded state or not, orwhether a temperature of cooling water for the engine 51 is in thenormal range or not, and when a controller body 572 detects an abnormalstate with sensors or the like provided in various sections, any of theindicators lights up to indicate the abnormal section for alerting theoperator to check the section. The operating state display lamps and thelike are mounted on a side in the lateral direction of the movable woodcrushing machine 1, and can visually be checked from the outside via atransparent acrylic cover covering this panel surface. Further when anyabnormal state is generated, a turning lamp is lit in the upper sectionof the operation panel so that the operator can visually check thestate.

[3] Structure of the Rotary Crushing Device 6

FIG. 6 to FIG. 8 each show a structure of the rotary crushing device 6,this rotary crushing device 6 is provided under the tab-type feeder 7,and comprises a support frame 61 attached to the vehicle body 2, arotary crusher 62 supported by the support frame 61 and rotating arounda substantially horizontal axis and a screen member 63 surrounding thisrotary crusher 62 from the outside, and when the rotary crusher 62 isrotated by the mill motor 6A provided at an edge section thereof, therotary crusher 62 crushes wood.

The support frame 61 has a front wall 611, a rear wall 612, and a pairof side walls 613, 614, and a collar section 615 for mounting projectsoutward from each of the side walls 613, 614.

This collar section 615 is fixed with a fitting tool (not shown) such asa bolt member or the like to a frame of the vehicle body 2. Althoughdescribed in details later, an opening 711 having a rectangular formwhen viewed from the top is formed on the tab receiving frame 71 forminga bottom section of the tab-type feeder 7, and the support frame 61 ispositioned on a rear surface of the tab receiving frame 71 at a positionopposite to this opening 711, and the rotary crusher 62 of the rotarycrushing device 6 is exposed from the opening 711 of the tab receivingframe 71.

The rotary crusher 62 has a shaft section 621 and a rotary drum 622, andthe two edges are rotatably supported by the front wall 611 and the rearwall 612 of the support frame 61.

Specifically, a notch 616 is formed on each of the front and rear walls611, 612 of the support frame 61, and the rotary crusher 62 is engagedin the notch 616.

The shaft section 621 is a shaft-like body extending along the rotatingshaft of the rotary crusher 62, and the two edges thereof are coupled tothe mill motor 6A as a drive source.

The rotary drum 622 is a cylindrical body rotatably provided around therotation axis of this shaft 621 and a plurality of crushing sections 623and protectors 624 are provided on an external peripheral surface of therotary drum 622.

The crushing section 623 has a plurality of bits 625 and holders 626dismountably holding the bits 625 respectively as shown in FIG. 7, andwhen the rotary drum 622 rotates, the bits are also turned inassociation with rotation of the rotary drum 622 to strike and crush thewood.

The protector 624 is a plate-like body projecting outward in the radialdirection of the rotary drum 622 and extending along the rotationaldirection.

The screen member 63 is a substantially cylindrical body with a numberof discharge holes 632 provided on a peripheral wall 631 surrounding therotary drum 622, and edge sections in the longitudinal direction alongthe substantially horizontal center line are attached to the front andrear walls 611, 612 respectively.

A portion of the peripheral wall 631 of the screen member 63 is notchedto form an upper opening 633. A clearance 634 is formed between an innersurface of the screen member 63 and an external surface of the rotarydrum 622.

A curvature of the internal surface of the screen member 63 is set to avalue slightly larger than a radius of the track K drawn by a tip of thebit 625 of the crushing section 623 when the rotary crusher 62 rotates.

Further an opening edge rim section 635 of the screen member 63 ispositioned at a higher level than a rotation center O2 of the rotatingshaft of the rotary crusher 62. Because of this feature, as shown inFIG. 7, the clearance 634 formed between an internal surface of thescreen member 63 and an external peripheral surface of the rotary drum622 has a feeding side opening 636 having a rectangular form when viewedfrom the top and a discharge side opening 637 also having a rectangularform when viewed from the top.

In the rotary crushing device 6 as described above, different from thecrushing machine based on the conventional technology, a deflector isnot provided at the opening, and a space above the opening 711 formed inthe bottom section of the tab-type feeder 7 is secured up to thescattering prevention cover 75 provided in the hopper 74 of the tab-typefeeder.

A cover member 64 surrounding the rotary crusher 62 is provided underthe support frame 61, and this cover member 64 guides wood chips crushedby the rotary crusher 62 and having passed through discharge holes 632of the screen member 63 to the conveyer 4.

[4] Structure of the Tab-Type Feeder 7

The tab-type feeder 7 has, in addition to the tab receiving frame 71,rotary tab 72, column 73, hopper 74, and scattering protection cover 75shown in FIG. 1 to FIG. 3, a rotary mechanism 77 for rotating the rotarytab 72 and a tension loading mechanism 78 as shown in FIG. 9, and therotary tab 72 is rotated on the tab receiving frame 71 by the rotarymechanism 77 with the tab motor 7A as a drive source.

The tab receiving frame 71 comprises a plate-like body provided on thevehicle body 2 via the swinging mechanism 8, and an opening 711 forfeeding wood therethrough to the rotary crushing device 6 is provided ata position corresponding to a position of the rotary crushing device 6.

(4-1) Structure of the Rotary Tab 72

The rotary tab 72 comprises, as shown in FIG. 10A, FIG. 10B, FIG. 11,and FIG. 12, a tab body 721 having a cylindrical form, a pair ofexternal collar sections 722, 723 for guidance each projecting from anexternal surface of this tab body 721, a sprocket 724, a guide member725, an external collar section 726, a projection 727 projecting from aninner surface of the tab body 721, and an internal collar section 728.

The tab body 721 is a cylindrical body having a rotation center O asshown in FIG. 10A.

A pair of the external collar sections 722, 723 are provided on anexternal peripheral surface at the lower edge section of the tab body721, and extend completely around the tab body 721 along the peripheraldirection thereof, and the external collar sections 722 and 723 areprovided substantially in parallel to each other. A space between theexternal collar sections 722, 723 is described as a guide groveextending along the periphery of the tab body 721.

The sprocket 724 and the guide member 725 are provided in the protrudingstate above the external collar section 722 for guidance as shown inFIG. 11, and extend around the tab body 721 substantially in parallel tothe external collar section 722 for guidance.

The sprocket 724 and the guide member 725 are provided alternately inthe peripheral direction of the tab body 721 as shown in FIG. 10B, andalthough described later a gear teeth row is formed at a tip of thesprocket 724, and the projection of the tip section of the guide member725 is smaller than that of the gear teeth row of the sprocket 724 andis set at the height at which a pitch circle P formed by the sprocket724 can substantially be maintained by a chain 775 described later.

The external collar section 726 is provided further above the sprocket724 and the guide member 725 and projects from an external peripheralsurface of the tab body 721 and continuously extends in the peripheraldirection of the tab body 721.

As shown in FIG. 10A and FIG. 12, the projections 727 protrude upwardand downward on an internal peripheral surface of the tab body 721, andin this embodiment, are provided with a prespecified pitch at fourplaces in the peripheral direction. Each of the projections 727 has afront section in the rotating direction along the normal direction tothe internal peripheral surface of the tab body 721, and a rear sectionin the rotating direction has a substantially right-triangular and flatform inclined more as compared to the front section.

An internal collar section 728 extends in the projecting statecompletely around the tab body 721 along the peripheral direction of thetab body 721 at a position close to an upper opening 72A of the tab body721.

(4-2) Structure of the Rotary Mechanism 77

The rotary mechanism 77 comprises, as shown in FIG. 9, horizontalrollers 771 and vertical rollers 772 provided at four positions aroundthe rotary tab 72, a support frame 773 for supporting the tab motor 7Adescribed above, a sprocket 774 provided at an output shaft 7A1 of thetab motor 7A, and a chain 775 wounded around the rotary tab 72.

As shown in FIG. 13, the horizontal roller 771 is rotatably supportedvia a bearing 771B by a column 771A provided in the upright state on thetab receiving frame 71, contacts a receiving plate member 771C providedin the guide groove between the external collar sections 722, 723 forguidance provided in an external peripheral surface of the tab body 721,and rotates in association with rotation of the rotary tab 72.

As shown in FIG. 14, the vertical roller 772 is rotatably supported viaa bearing 772C by a support shaft 772B projecting in the horizontaldirection from an upper edge of the column 772A provided in the uprightstate on the tab receiving frame 71, contacts the external collarsection 722 for guidance in the upper side to support the tab body 721,and rotates in association with rotation of the rotary tab 72. Theexternal collar sections 722, 723 are jointed with the main bodies 722A,723A projecting outward in the horizontal direction from the tab body721 at tip sections of the main bodies 722A, 723A in the diagonaldirection, and contact the vertical roller 772 at the portion of themain body 722A in the upper side.

The support frame 773 is provided, as shown in FIG. 15 and FIG. 16, onthe tab receiving frame 71, and a tension loading mechanism 78 describedlater is provided at an edge section of this support frame 773.

The sprocket 774 is fixed to the output shaft 7A1 of the tab motor 7A,and when the output shaft 7A1 rotates, also the sprocket 774 rotates.

The chain 775 is a roller chain formed by coupling a pin link 775A to aroller link 775B alternately via a pin 775C.

This chain 775 is built with a large and circular form, and is built towrap around the rotary tab 72 and the sprocket 774 provided on the tabmotor 7A, and engages with an external peripheral surface of thesprocket 774, and also engages with the sprocket 724 provided in theprojecting state on an external peripheral surface of the rotary tab 72.

The sprocket 724 and the guide member 725 in the rotary tab 72 areprovided at the same position in the vertical direction, so that, whenthe chain 775 is engaged with the sprocket 724, a tip section of theguide member 725 closely contacts an internal surface of the chain 775and guides the chain 775.

More specifically, when the chain 775 is engaged with the sprocket 775as shown in FIG. 17, a roller 775D with a pin 775C inserted thereinengages with a concave teeth 724A of the sprocket 724, and an externalperipheral surface of the roller 775D rotates contacting an internalsurface of the concave teeth 724A.

On the other hand, the guide member 725 is inserted between and engagedwith the pink link 775A and roller link 775B opposite to each other onthe chain 775 as shown in FIG. 18, and the tip section closely contactsan internal peripheral surface of the roller 775D, so that the pitchcircle P formed with the sprocket 724 can substantially be maintained bythe chain 775 as described above (Refer to FIG. 10B).

As for the dimensions of the components described above, the height T1of the tab body 721 of the rotary tab 72 from the external surfacethereof to a bottom of the concave teeth 724A of the sprocket 724 is setto the substantially same value as the thickness T2 of the guide member725, and further the dimension S between roller links 775B opposite toeach other of the chain 775 is larger than the dimension W of the guidemember 725 in the vertical direction.

(4-3) Structure of the Tension Loading Mechanism 78

The tension loading mechanism 78 comprises a swinging arm 781, asprocket 782, an elastic member 783, and an adjusting member 784 asshown in FIG. 15.

As shown in FIG. 19, an edge of the swinging arm 781 is externallyengaged with a support shaft 773A provided in the upright state on thesupport frame 773 so that a boss section 773B can rotate, and the edgeof the swinging arm 781 is fixed to this boss section 773B at the edgethereof to swing around a center of the support shaft 773A.

This swinging arm 781 has a pair of flat plate bodies 781A, 781Bprovided in the upper and lower sides respectively, and the sprocket 782is mounted between the flat plate bodies 781A, 781B at the other edge ofthe swinging arm 781 in the contrary side from the center for swinging.

Further an upper coupling piece 781C is provided on the flat plate body781A in the upper side, and a lower coupling piece 781D is provided onthe flat plate body 781B in the lower side.

A bolt member 781E penetrates these upper coupling piece 781C, flatplate body 781A, sprocket 782, flat plate body 781B, and lower couplingpiece 781D, and a nut member 781F is screwed onto a tip portion of thescrew section of this bolt member 781E.

The sprocket 782 is rotatably mounted via a bearing 781G externallymounted on a shaft section of the bolt member 781E.

Hooking holes 781H, 781I are formed in the upper coupling piece 781C andlower coupling piece 781D respectively, and a hook section 783A providedat one edge of the elastic member 783 such as a coil spring is hooked ineach of the hooking holes 781H, 7811 as shown in FIG. 20.

A hook section 783B provided at the other edge of this elastic member783 is coupled to the adjusting member 784.

The adjusting member 784 has a fixed frame 784A, a bolt member 784B, anut member 784C, and hooking pieces 784D, 784E as shown in FIG. 20.

The fixed frame 784A is a plate body provided on the tab receiving frame71 in the upright state, and is positioned so that the pulling directionof the elastic member 783 is oriented toward an outer side from asurface of the fixed frame 784A with a throughhole formed in the uppersection thereof. Provided on a surface of the fixed frame 784A with theelastic member 783 provided thereon is a reinforcing rib plateperpendicular thereto.

The bolt member 784B is inserted into the throuhghole formed in thefixed frame 784A, and a bolt head of the bolt member 784B is positionedon a surface of the fixed frame 784A in the contrary side from thesurface on which the elastic member 783 is provided.

The nut member 784C is screwed onto a tip portion of the bolt member784B, and the nut member 784C makes it possible to change positions ofthe bolt member 784B for forward and backward movement in the axialdirection by changing a screwed position of the nut member 784C with thebolt member 784B.

The hooking piece 784D is a plate body provided on an externalperipheral surface of the nut member 784C in the protruding state, and asurface of the plate body is provided along the axial direction of thebolt member 784B. A notched concave section is formed on a side edge ofthis hooking piece 784D in the side close to the fixed frame 784A, andthe hooking section 783B at the other edge of the elastic member 783 isengaged in this concave section.

In the tension loading mechanism 78 having the structure as describedabove, as shown in FIG. 15, the sprocket 782 is engaged in the externalperipheral side of the chain 775 to energize the chain 775 from theoutside, so that an appropriate tension is loaded to the chain 775.

For adjusting the energizing force, as shown in FIG. 20, when thescrewed position of the nut member 784C is changed to the fixed frame784A, a tensile force of the elastic member 783 increases, so that thesprocket 782 is pulled and energized in a direction in which the chain775 is pressed, and therefore a force of the chain 775 for tighteningthe rotary tab 72 becomes larger. On the contrary, when the screwedposition of the nut member 784C is moved away from the fixed frame, atensile force of the sprocket 782 toward the fixed frame 784A becomessmaller, and therefore a force of the chain 775 for tightening therotary tab 72 becomes smaller.

As described above, by adjusting a screwed position of the nut member784C, a tension to be loaded to the chain 775 is adjusted.

(4-4) Structure of the Hopper 74

The hopper 74 has a charging opening 76 for charging wood inclinedagainst the horizontal surface, and a scattering protection cover 75 isprovided over and covers a portion of this charging opening 76. Namely,as shown in FIG. 21, the hopper 74 is a substantially cylindrical bodyhaving the charging opening 76 inclined against the rotary tab 72 havinga substantially cylindrical form so that the opening 76 is inclinedagainst the horizontal face, and has a portion with a large height and aportion with a small height.

This hopper 74 is supported on and by the tab receiving frame 71 (notshown in FIG. 21) provided on the vehicle body 2 with the three columns73 as described above.

Each of the three columns 73 has a first member 731 provided on the tabreceiving frame 71 in the upright state, and a second member 732 jointedto the hopper 74.

The first member 731 is a column-like member comprising a square steelpipe with a seat plate 733 provided at a lower edge thereof and isjointed to the tab receiving frame 71 with the seat plate 733. An upperedge face of the first member 731 is cut diagonally and is shielded witha receiving plate section 734.

Also the second member 732 comprises a square steel pipe with a mountingplate section 735 provided on a lower edge face thereof, and is mountedon and jointed with a bolt nut or the like to the receiving platesection 734 of the first member 731.

As described above, the hopper 74 is supported with the three columns73, so that the hopper 74 is not engaged with the rotary tab 72 andprovided in the state where the hopper 74 surrounds the rotary tab 72.

The hopper 74 comprises, as shown in FIG. 21 and FIG. 22, a cylindricalbody 741, a circular member 742 provided under and jointed to thecylindrical body 741, and a collar section 743 having a form like afunnel and provided at an upper rim of the cylindrical body 741.

The cylindrical body 741 is a cylindrical body with an upper edgethereof diagonally cut off and having the horizontal lower edge rim, andfurther a notched section 744 is formed on a lower rim of the portionhaving a large height. Because of this structure, a center line 01 ofthe cylindrical body 741 is inclined to a prespecified direction againstthe vertical axis with a prespecified angle, and a height of theperipheral wall 741A becomes gradually larger from the L portion to theH portion as shown in FIG. 22.

As shown in FIG. 22 and FIG. 23, the circular member 742 is a steel-madecylindrical body diagonally cut off and having a substantiallytriangular form when viewed from the side or a substantiallysemi-circular form when viewed from the top, and is engaged in a notchedsection 744 provided on a lower edge rim of the cylindrical body 741,and the external peripheral surface thereof extends along the verticalsurface.

When the circular member 742 is not provided, the outer diameter of thelower edge of the hopper 74 is equal to D, but when the circular member742 is provided, the outer diameter of the lower edge of the hopper 74is D1 smaller than D, so that the outer diameter of the hopper 74 can bemade smaller.

The lower edge rim of the circular member 742 and the lower edge rim ofthe cylindrical body 741 (excluding the notched section 744) form alower edge rim of this hopper 74, and as shown in FIG. 25, a ring-formedexternal collar section 745 is attached along the lower edge rim.

A plurality of nut members 746 are attached to this external collarsection 745, and a covering member 747 as shown in FIG. 26 is attachedto this nut member 746.

This covering member 747 comprises, as shown in FIG. 26, three flatplate bodies 747A, 747B, 747C, and each of the flat plate bodies 747A,747B, 747C is attached to the collar section 743 of the hopper 74 bysetting the bolt member 748 in the nut member 746 provided on the collarsection 743.

When the hopper 74 having the structure as described above is attachedand fixed to the column 73 provided on the tab receiving frame 71 in theupright state as shown in FIG. 21, the lower edge rim section of thehopper 74 is engaged in the idling state with the upper edge rim sectionof the rotary tab 72.

In the portion of the hopper 74 having a larger height, the circularmember 742 is provided, and this circular member 742 surrounds the upperedge rim section of the rotary tab 72.

Because of this structure, as shown in FIG. 26, the clearance G formedbetween the upper edge rim section of the rotary tab 72 and the loweredge rim section of the hopper 74 can be made smaller, and thereforethis circular member 742 can be called as a contracted section 742A inwhich the clearance G is reduced.

In other words, when the circular member 742 is not provided, asindicated by the virtual line in FIG. 26, the lower edge rim section inthe portion of the hopper 74 having a large height is at the positionindicated by the virtual line, so that the clearance G1 of this portionbecomes larger.

In contrast, when the circular member 742 is provided, the clearance G1corresponding to the clearance G2 becomes extremely smaller as indicatedby the solid line.

Further in the contrary side from the clearance G2, namely in theportion having a small height, as the covering member 747 formed withthe three flat plate bodies 747A, 747B, and 747C is attached to thecollar section 743 of the hopper 74, so that the clearance G3 can bemade smaller.

(4-5) Structure of the Scattering Prevention Cover 75

The scattering prevention cover 75 is provided as shown in FIG. 21 onthe hopper 74. This scattering prevention cover 75 is supported so thatthe cover 75 can swing against the hopper 74 allowing for the closedstate as shown with the solid line in FIG. 21 and the open state asshown with a virtual line in FIG. 21.

A cylinder mechanism 751 is used for swinging the scattering preventioncover 75.

In the portion of the hopper 74 having a large height, as shown in FIG.22 and FIG. 23, a pair of support sections 753 each comprising a pair ofsupport pieces 752 is provided in the collar section 743 of this hopper74.

On the other hand, provided on the scattering prevention cover 75 areprojecting piece sections 754 as shown in FIG. 21 and FIG. 23, and eachof the projecting piece sections 754 is provided between the supportpieces 752 in the support section 753, and is coupled via a supportshaft 755 to the support section 753.

With this structure, the scattering prevention cover 75 can swing in thedirections shown with the arrows a and β around the support shaft 755.

Provided on the mounting plate section 735 of the second member 732 ofthe column 73 in the large height portion of the hopper 74 is a supportsection 757 comprising a pair of support pieces 756 as shown in FIG. 22to FIG. 24. Coupled to this support 757 is the support piece 751B of thecylinder body 751A in the cylinder mechanism 751 via a support shaft(not shown in the figures).

On the scattering prevention cover 75, the support piece section 758 isprovided between the projecting piece sections 754 (Refer to FIG. 2),and a tip of a piston rod 751C of the cylinder mechanism 751 ispivotably coupled to this support piece section 88.

With this structure, when the piston rod 751C of the cylinder mechanism751 is contracted from the state shown with the solid line in FIG. 21,the scattering prevention cover 75 swings in the direction indicated bythe arrow β around the support shaft 755 and is set in the open stateshown with the virtual line in the figure.

On the contrary, when the piston rod 751C of the cylinder mechanism 751is extended from the open state shown with the virtual line, thescattering prevention cover 75 swings in the direction indicated by thearrow a around the support shaft 755 and is set in the closed state.

As described above, the hopper 74 has a charging opening 76 inclinedagainst the horizontal surface, and further the scattering preventioncover 75 is provided over this charging opening 76 from an edge sectionof the charging opening 76 in the lateral direction of the vehicle body(Refer to FIG. 2) to the other edge section of the drive unit 5.

Because of the structure as described above, the movable wood crushingmachine 1 according to this embodiment is restricted in regard to thewood charging direction, and therefore the direction in which the woodis charged is restricted in this movable wood crushing machine 1.Namely, in FIG. 2, the charging direction is to a corner formed with aleft side face in the traveling direction and a rear surface of thecover 21.

Further as shown in FIG. 4, the tab motor 7A for driving the rotarymechanism 77 is positioned at a corner section contrary from that forcharging wood.

[5] Structure of Swinging Mechanism 8

The tab-type feeder 7 as described above is provided on the vehicle body2 via the swinging mechanism 8, and when the swinging mechanism 8 isoperated, the tab-type feeder 7 can take two postures, namely a posturefor working shown with the solid line and a swinging posture shown withthe virtual line as shown in FIG. 28.

The swinging mechanisms 8 are provided at two positions along a sideface of the vehicle body 2 as shown in FIG. 28 to FIG. 30, and eachswinging mechanism 8 comprises a hydraulic cylinder 81, a bracket 82, acoupling shaft 83, a working posture stopper 84, and a swinging posturestopper 85.

As shown in FIG. 28 and FIG. 29, the hydraulic cylinder 81 comprises acylinder body 811, and a piston rod 812 extending to and contractingfrom the cylinder body 811. A base section of the cylinder body 811 isrotatably supported under a side face of the vehicle body 2, and a tipsection of the piston rod 812 is rotatably supported on the bracket 82.

The bracket 82 is a steel-made member comprising a bottom plate section821, and side plate sections 822, 823 as shown in FIG. 31 to FIG. 33 andhaving a form like a horseshoe when viewed from the side in thetraveling direction of the movable wood crushing machine 1.

The bottom plate section 821 is a portion fixed to the tab receivingframe 71 of the tab-type feeder 7, and is a rectangular plate bodyextending on the bottom surface of the tab receiving frame 71 along thetraveling direction, and this bottom plate section 821 is screwed to thetab receiving frame 71 with a plurality of bolt plate sections 821A.

The side plate section 822 is a plate body hanging from an edge rim ofthe bottom plate section 821 in the side close to the vehicle body 2,and has the width equivalent to the length dimension along the travelingdirection of the bottom plate section 821, and is jointed to the bottomplate section 821 by means of welding.

A rear portion of the side plate section 822 in the traveling directionextends in the vertical direction and has a reversely angled form, and ahole is formed in this reversely angled portion. A bearing 824 isprovided in this hole, and the coupling shaft 83 is set in the bearing824.

A pair of stiffeners 825 are provided above the position where thebearing 824 is provided, and each stiffener 825 is jointed to an edgeface of the bearing 824, bottom plate section 821, and side plates 822by means of welding.

A front portion of the side plate 822 in the traveling direction is asurface gradually included in the vertical direction as it goes forward,and a hole is formed at a position close to the front edge section.Inserted into this hole is a pin 826 for rotatably supporting a tipportion of the piston rod 812 of the hydraulic cylinder 81.

The side plate section 823 is a plate body jointed by welding to anouter edge rim of the bottom plate section 821 in the front side alongthe traveling direction of the bottom plate section 821, and a hole isformed on this side plate section 823 at a position corresponding to thehole in the front side of the side plate section 822. A bearing 827 isprovided in this hole, and the pin 826 is set in this bearing 827.

The coupling shaft 83 is a steel-made pin having a form like a column,and is set in the bearing 824 provided on the side plate section 822 asdescribed above with the tip section jointed to a steel frame portion ofthe vehicle body 2.

The working posture stopper 84 prevents generation of movement or thelike against the vehicle body 2 when the tab-type feeder 7 is operating,and is provided on the side face of the vehicle body 2 at a positionforward as compared to the bracket 82 as shown in FIG. 28. This workingposture stopper 84 projects outward from the side face of the vehiclebody 2, and has a pair of plate bodies each extending in the virtualdirection, and buffer materials each comprising an elastic material areprovided on opposing faces of the plate bodies.

On the other hand, provided on a bottom surface of the tab receivingframe 71 is a projection 712 protruding outward from the surface, andwhen the tab-type feeder 7 is set in the working posture, the projection712 goes into a section between the two plate bodies and absorbsmovement with the buffering materials.

The swinging posture stopper 85 is a plate body hanging toward a lowersurface of the vehicle body 2 at the rear edge position, and a bufferingmaterial comprising an elastic member is provided on a surface of thestopper 85 contacting the tab-type feeder 7, and when the tab-typefeeder 7 is swung by 90 degrees and set in the vertical posture, thesurface contacts a bottom surface of the tab receiving frame 71.

With the swinging mechanism 8, the tab-type feeder 7 can swing bysubstantially 90 degrees to the rear section of the vehicle body 2 asindicated by the chain double-dashed line. More specifically, when thepiston rod 812 of the hydraulic cylinder 81 described above iscontracted, the tab-type feeder 7 is set in the working posture, andwhen the piston rod 812 of the hydraulic cylinder 81 is extended, thetab-type feeder 7 is set in the swinging posture, namely in the postureswung by 90 degrees.

The maximum height F from the ground of the tab-type feeder 7 inswinging is set to smaller value as compared to the maximum height Efrom the ground of the tab-type feeder 7 during working indicated by thesolid line.

Swinging of the tab-type feeder 7 effected by the swinging mechanism 8is performed when the rotary crushing device 6, rotary tab 72, or hopper74 are checked, serviced, cleaned, or transported.

In FIG. 28, when the tab-type feeder 7 is set in the working posture asshown with the solid line, the horizontal direction A from a center ofthe coupling shaft 83 to a front side edge section of the tab-typefeeder 7, namely to an edge section closer to the drive unit 5 issmaller than the vertical distance B from a center of the coupling shaft83 to the highest portion of the tab-type feeder 7 (A<B). Further, whenthe tab-type feeder 7 is set in the working posture, the horizontaldistance C from a center of the coupling shaft 83 to the rear side edgesection of the tab-type feeder 7 is smaller than the vertical directionD from the center of the coupling shaft 83 to the surface of the traveldevice 3 contacting the ground (C<D).

Further the coupling shaft 83 is positioned so that, when the tab-typefeeder 7 is swung by about 90 degrees backward as shown with the chaindouble-dashed line, the tab-type feeder 7 never interferes the traveldevice 3, and also so that swinging of the tab-type feeder 7 by aprespecified angle or more is prevented by the swinging posture stopper85.

Therefore, when the tab-type feeder 7 is swung by about 90 degreesbackward, the tab-type feeder 7 never interferes the ground surface, northe travel device 3. The height F of the tab-type feeder 7 from theground surface in the state is smaller than the height E (=B+D) of thetab-type feeder 7 in the working posture.

[6] Actions and Effects of the Movable Wood Crushing Machine 1

Actions and effects of the movable wood crushing machine 1 having thestructure as described above is described below.

(6-1) Actions of the Movable Wood Crushing Machine 1

As shown in FIG. 34, a loader PC is positioned at a position M in theleft side and forward from the movable wood crushing machine 1 andoffset from the direction N in which wood pieces spring out from thescattering prevention cover 75, in other words in the left side of acentral portion of the vehicle.

Wood to be crushed WD is stocked at a position Q where the wood to becrushed WD can be loaded into the hopper 74 by turning the loader PC inthe counterclockwise. This loader PC has an operator's chamber PC1 inthe left side of the front section of an upper swirling body and aworking machine PC2 for loading the wood to be crushed in the right sidefrom this operator's chamber PC1.

The wood to be crushed WD is picked up by the loader PC at the stockyard and loaded on the scattering prevention cover 75 of the hopper 74.Then the wood to be crushed WD slips down along the scatteringprevention cover 75 and are charged from the charging opening 76 notcovered with the scattering prevention cover 75 into the rotary tab 72.

The wood to be crushed WD stocked due to rotation of the rotary tab 72therein is fed to the rotary crushing device 6 and is crushed by thebits 625 attached to an external peripheral section of the rotarycrushing device 6 into small wood chips.

Of the crushed wood pieces, those each having the size smaller than ahole of the screen member 63 pass through the screen member 63 and droponto the conveyer 4 and are discharged forward to outside of the vehiclebody. Wood chips each having the size larger than the hole of the screenmember 63 are further crushed by the rotary crushing device 6 betweenthe rotary crushing device 6 and the screen member 63 and then drop fromthe screen member 63 onto the conveyer 4.

(6-2) Effects Provided by Layout of the Movable Wood Crushing Machine 1

Of the crushed wood pieces, a portion of those each having the sizelarger than the hole of the screen member 63 spring out upward of therotary crushing device 6 from a section between the rotary crushingdevice 6 and the screen member 63 due to a torque generated by therotary crushing device 6 and scatter to the internal wall surface of thetab-type feeder 7 as shown in FIG. 34 and FIG. 35. Also a portion ofwood to be crushed not having been crushed and with smaller sizescatters toward the internal wall surface of the tab-type feeder 7similarly.

FIG. 35 is a view showing the state where an internal surface of thetab-type feeder 7 is developed to the peripheral direction forillustrating reflection of the crushed wood pieces by the scatteringprevention cover 75.

Most of the scattered pieces fly along the rotating direction U of therotary crushing device 6, collide the internal wall surface of thetab-type feeder 7, and are reflected thereby, or collide the internalwall surface of the tab-type feeder 7 several times and then arereflected on the internal face of the scattering prevention cover 75,and drop into the tab-type feeder 7, but a portion of the wood piecesspring out from the charging opening 76 not covered with the scatteringprevention cover 75.

In this step, those reflected at higher positions of the tab-type feeder7 scatter over a short distance and collide the internal face of thescattering prevention cover 75, while those reflected at lower positionsof the tab-type feeder 7 fly over a long distance, and then arereflected again at higher positions of the tab-type feeder 7, andcollide the internal face of the scattering prevention cover 75.

Because of the features as described above, most of the scattered piecesare reflected by the scattering prevention cover 75 and do not springout of the tab-type feeder 7. Only a few portion of the pieces is notprevented from springing out and scatters from the charging opening 76not covered with the scattering prevention cover 75 in the direction asindicated by the white arrow in FIG. 34 springing out of the tab-typefeeder 7.

As described above, the tab-type feeder 7 and conveyer 4 are separatedfrom each other and provided in the opposite sides of the vehicle bodyin the longitudinal direction, so that crushed matters not having beenscreened according to the size by the screen member 63 or wood to becrushed WD not having been crushed scattering and springing out of thecharging opening 76 of the tab-type feeder 7 is never mixed in thecrushed wood pieces having been screened according to the size on theconveyer 4, which makes it possible to uniform size of the wood piecesdischarged by the conveyer 4 as a product.

In the step of charging the wood to be crushed WD with the loader PCinto the hopper 74, uncontrolled wood to be crushed WD never drops ontothe conveyer 4, which ensures improvement in the product quality.

When the loader PC loads the wood into the hopper 74, interference tothe conveyer 4 never occurs, which enables increase of a freedom in adirection of loading with the loader PC and improvement of efficiency inthe loading work.

As the charging opening 76 of the hopper 74 to be visually checkedduring the loading work, monitor display units in the operation panel57, and the net 58 for an externally mounted cover provided in theupstream side from the cooling fan to be checked are positioned in oneside of the vehicle body, an operator in the operator's chamber PC1 ofthe loader PC can easily and visually recognize and check the situationduring the loading work, which ensures the very high work efficiency.

Further as the fuel tank 52 is positioned in the same side as that inwhich the operation panels 57 and the components are provided, even ifthe movable wood crushing machine 1 is positioned with the other sidecontrary from the side described above in the lateral direction of thevehicle body oriented toward a hardly accessible place such as a wall ofthe site or the like, access, visual recognition, and checking caneasily be carried out from the side where the above-described componentsplaced, so that a place for installment of a wood crushing machine canflexibly be selected at a working site.

(6-3) Effects Provided by Prevention of Scattering

As shown in FIG. 36, crushed matters not discharged downward via thescreen member 63 scatter via the discharge side opening 637 into thetab-type feeder 7. In this step, the crushed matters scattering into thetab-type feeder 7 in association with rotation of a rotary drum 622scatter substantially upward, but as an opening edge rim section 635 ofthe screen member 63 is positioned at a level higher than a rotationcenter O2 of the rotary crusher 62, the position is displaced from theclearance G between the hopper 74 and the rotary tab 72, so that thematters scatter in a direction deflected from a position just above therotary crusher 62 as indicated by the arrow J in FIG. 36 from thedischarge side opening 637 toward the scattering prevention cover 75.

The top side of the charging opening 76 of the tab receiving frame 71 isopen, so that, even when crushed matters scatter from inside the rotarycrushing device 6, there is no member preventing scattering of thematters, which prevents the crushed matters from being stocked at anoutlet port in the side where the crushed matters scatter.

Because of this structure, an excessive load is never loaded to the millmotor 6A for rotating the rotary crusher 62, which prevents slowrotation or stop of rotation of the mill motor 6A, and thereforeoperation down can be evaded. Further, clogging of crushed mattersseldom occurs, so that a frequency of the work for removing the crushedmatters can be reduced.

Further wood fed into the tab-type feeder 7 is prevented from being hungup or held by components and is smoothly guided into the rotary crushingdevice 6. Because of this feature, an excessive load is never applied tothe tab motor 7A for rotating the tab-type feeder 7, which prevents slowrotation or stop of rotation of the tab motor 7A, and thereforeoperation down is evaded.

As described above, the operating life of each of the motors 6A, 7A canbe prolonged, which makes it possible to carrying out the crushing workfor a long period of time with the work efficiency improved, and inaddition the convenience in a maintenance work for the motors 6A, 7A andother related components can be improved.

The crushed matters scattered from the rotary crushing device 6positioned at a low position collide the scattering prevention cover 75and drop downward, so that the crushed matters are prevented fromflowing out from a clearance (positioned diagonally above the crushedpieces) between the hopper 74 and the rotary tab 72. Because of thisfeature, contamination of the outer side of the machine with the crushedmatters can be reduced, and the rotary crushing device can easily bewashed or cleaned after a crushing work is finished, so that conveniencein maintenance for the machine can be improved.

The crushed matters not discharged downward via the screen member 63scatter from the clearance 634 substantially upward, but the openingedge rim section 635 of the screen member 63 is positioned at a higherlevel than the rotation center O2 of the rotary crusher 62, and theposition is displaced from the clearance G between the hopper 74 and therotary tab 72, so that the crushed matters scatter in a direction offsetfrom the vertical axial line of the rotary crusher 62.

Because of this feature, the scattering prevention cover 75 forpreventing the crushed matters from scattering to the outside isrequired only to receive those scattering along the direction describedabove, so that the size of the cover 75 may be relatively small, and thecharging opening 76, which is an upper opening of the hopper 74, can bemade larger. Because of this structure, the efficiency in loading woodinto the hopper 74 can be improved.

(6-2) Effects of the Tab-Type Feeder 7

The hopper 74 has a contracting section 742A for contracting theclearance G between an upper edge rim section of the rotary tab 72 and alower edge rim section of the hopper 74, so that the clearance G betweenan upper edge rim section of the rotary tab 72 and a lower edge rimsection of the hopper 74 can be reduced, and as a result, a quantity ofcrushed materials flooding or scattering from this clearance G can bereduced.

Because of this feature, contamination of the outside of the machinewith the crushed matters can further be reduced, and the crushingmachine can easily be washed and cleaned after completion of a crushingwork with the convenience in maintenance further improved.

As the contracting section 742A is provided, the outer dimension of thiscontracting section 742A can be made smaller, so that the outerdimension of the entire hopper when viewed from the top can be madesmaller.

Namely, different from the wood crushing machine based on theconventional technology, with the present invention, only the outerdimension of the contracting section can be made smaller, while thediameters of other portions can be made larger within the restrictionsfor transportation.

Because of this feature, a diameter of the rotary tab 72 and a holediameter of the charging opening 76 of the hopper 74 can be made larger,so that the wood loading area can be enlarged with the convenience inthe loading work improved.

In the small height portion of the hopper 74, a quantity of crushedmaterials flooding (scattering) to the outside is small, and there is noneed for providing the contracting section 742A, so that the height ofthe entire hopper 74 can be suppressed to a smaller value. With thisfeature, for instance, even if this wood crushing machine isself-propelled, restriction over the height thereof can be evaded.

When the contracting section 742A is provided, it is necessary toconnect components each constituting the contracting section 742A bywelding or the like, and therefore as compared to the case in which thecontracting section 742A is provided along the entire periphery, thewood crushing machine according to the present invention can be producedwith improved efficiency and lower cost as compared to that based on theconventional technology.

As the contracting section 742A is provided in the large height portionof the hopper 74, the clearance G between an upper edge rim section ofthe rotary tab 72 and a lower edge rim section of the hopper 74 can bereduced in the large height portion of the hopper 74, and further theclearance G in the small height portion of the hopper 74 can be madesmaller.

Because of this feature, the entire clearance formed along the entireouter periphery of the upper edge rim section of the rotary tab 72 canbe made smaller, so that a quantity of crushed materials flooding(scattering) from the clearance G can be reduced with the reliabilityimproved.

Namely the quantity of crushed materials flooding (scattering) from theclearance G formed along the entire outer periphery of the upper edgerim section of the rotary tab 72 can further be reduced. Because of thisfeature, contamination of the wood crushing machine with crushedmaterials can substantially be reduced to an extremely low level.

As the chain 775 provided along the entire periphery of the tab body 721of the rotary tab 72 engages with the sprocket 724 provided in the tabbody 721 of the rotary tab 72, the torque can securely be delivered tothe rotary tab 72 via the chain 775. Further as travel of the chain 775is guided by the guide member 725 provided in the rotary tab 72, thechain 775 can travel in the stable condition, which stabilizes rotationof the rotary tab 72.

Because of this feature, wood can securely be supplied to the rotarycrushing device 6 provided under the rotary tab 72, which enables acrushing work with high efficiency.

As the guide member 725 is provided on an external peripheral surface ofthe rotary tab 72, the solidity of the rotary tab 72 is improved, whichenables realization of the tab-type feeder 7 with excellent durability.

Further, it is not necessary to provide the sprocket 724 along theentire periphery of the external peripheral surface of the rotary tab72, so that further cost reduction is possible as compared to the casein which the sprocket is provided along the entire periphery.

The chain 775 can substantially maintain with the guide member 725 thepitch circle P formed between with a plurality of sprockets 724, so thatthe chain 775 smoothly runs and an overload to the chain 775 can beprevented.

Because of the feature, the chain 775 smoothly runs with an overload tothe chain 775 prevented. Therefore, an operating life of the chain 775is prolonged, and a crushing work can be performed for a long period oftime in the stable condition.

The guide member 725 is engaged in a section between the pin link 775Aand a roller link 775B opposite to each other on the chain 775, so thatengagement of the chain 775 with the sprocket 724 can further betightened. Namely, the engagement efficiency of the chain 775 isimproved and the chain 775 smoothly engages with the sprocket 724, whichprevents the chain 775 or sprocket 724 from being broken or damaged.

The tab motor 7A for driving the rotary mechanism 77 is provided at aposition offset from a position just below a place where wood passesover when wood being charged, so that such troubles as drop of chargedwood onto the tab motor 7A can be prevented.

Because of this structure, driving of the tab motor 7A or the like canbe prevented from being hampered, which ensures stable rotation of therotary tab 72 and protects the tab motor 7A and the like with theoperating life of the rotary mechanism 77 prolonged.

The charging opening 76 of the hopper 74 is inclined against thehorizontal direction for restricting a direction in which wood ischarged, so that the work for charging wood is stabilized with the workefficiency improved.

(6-4) Effects of the Swinging Mechanism 8

As the movable wood crushing machine 1 has the swinging mechanism 8,when the scattering prevention cover 75 is opened as shown in FIG. 37and the tab-type feeder 7 is swung in the backward direction of thevehicle body 2 for cleaning inside of the tab-type feeder 7, if the woodto be crushed WD overflows from the inside, the tab-type feeder 7 cansmoothly be removed without loading an unnecessarily large force bytraveling the vehicle frontward, so that the work for carrying out woodremaining inside the tab-type feeder 7 can easily be performed.

Such works as checking, maintenance, and cleaning for the rotarycrushing device 6 and tab-type feeder 7 can be performed from eitherside of the vehicle.

The height F of the tab-type feeder 7 from the ground surface in theswinging posture is low, and therefore when the movable wood crushingmachine 1 is mounted and transported on a trailer TR in the state wherethe scattering prevention cover 75 is closed and the tab-type feeder 7is swung to the rear side of the vehicle body 2 as shown in FIG. 38, theentire height H of the vehicle can be suppressed to a value lower thanthe maximum value allowable under traffic control for transportation.

INDUSTRIAL AVAILABILITY

The present invention is applicable not only to the movable woodcrushing machine having a crawler type travel device with a caterpillar,but also to a movable wood crushing machine having other types oftraveling devices such as a tyre.

1. A movable wood crushing machine for producing crushed wood chips by crushing charge wood, comprising: a vehicle body provided with a travel device for traveling; a rotary crushing device provided at one edge of this vehicle body in the traveling direction for crushing said wood into said wood chips; a tab-type feeder having a rotary tab rotatably provided on this rotary crushing device with a charging opening for charging wood to be crushed formed in upper part thereof; a conveyer extending from a position under said rotary crushing device toward the other edge of said vehicle body in the traveling direction for transferring and discharging wood chips crushed by said rotary crushing device to the outside; and a drive unit provided between said rotary crushing device and said conveyer for driving drive sources for said travel device, said rotary crushing device, said tab-type feeder, and said conveyer.
 2. The movable wood crushing machine according to claim 1, wherein said rotary crushing device is provided at a position adjacent to said drive unit; and said tab-type feeder has a scattering prevention cover provided at a position corresponding to the position of said rotary crushing device for covering said charging opening.
 3. The movable wood crushing machine according to claim 2, wherein an opening for feeding wood to said rotary crushing device is formed at bottom section of said tab-type feeder; and said scattering prevention cover is provided at a position covering the opening when viewed from the top.
 4. The movable wood crushing machine according to claim 2, wherein said scattering prevention cover extends from an edge section of the charging opening of said tab-type feeder on the side closer to the drive unit in the traveling direction toward an edge section in the lateral direction perpendicular to the traveling direction.
 5. The movable wood crushing machine according to any of claim 1, wherein an operation panel for driving and operating various devices including said drive unit is provided on a side face in the lateral direction perpendicular to the traveling direction of said vehicle body; a cooling air inlet section for said drive unit is formed on the side face with the operation panel provided thereon; and this cooling air inlet section is covered with a covering device allowing visual check of clogging on the surface thereof.
 6. The movable wood crushing machine according to claim 1, wherein said vehicle body is provided with a swinging mechanism for swinging said tab-type feeder toward end of said vehicle body in the traveling direction.
 7. The movable wood crushing machine according to claim 6, wherein said swinging mechanism has a coupling shaft swingably bearing said tab-type feeder on said vehicle body; and when said tab-type feeder is in a posture for working, the horizontal distance from the center of said coupling shaft to an edge section of said tab-type feeder on the side closer to said drive unit along the traveling direction of said vehicle body is shorter than the vertical distance from the center of said coupling shaft to the highest part of said tab-type feeder.
 8. The movable wood crushing machine according to claim 7, wherein when said tab-type feeder is in a posture for working, the horizontal distance from the center of said coupling shaft to an edge section of said tab-type feeder on the contrary side from said drive unit along the traveling direction of said vehicle body is shorter than the vertical direction from the center of said coupling shaft to a position of said travel device contacting the ground surface.
 9. The movable wood crushing machine according to claim 5, wherein said tab-type feeder comprises: a base plate fixed on said vehicle body; a rotary tab rotatably provided on this base plate; and a hopper provided in the upper part of the rotary tab and supported by a column erected from said base plate.
 10. The movable wood crushing machine according to claim 6, wherein said swinging mechanism has a swinging restricting section for inhibiting a swinging movement of said tab-type feeder up to a position causing interference to said travel device when said tab-type feeder is swung around said coupling shaft.
 11. The wood crushing machine according to claim 1, wherein a screen member allowing passing through only the wood chips crushed by said rotary crushing device having a prespecified size or below is provided between said rotary crushing device and said conveyer; and this screen member is provided around a rotary shaft of said rotary crushing device to surround said rotary crushing device with an upper edge thereof provided at a position higher than the rotary shaft of said rotary crushing device when viewed from a position of said rotary shaft.
 12. The movable wood crushing machine according to claim 3, wherein said scattering prevention cover extends from an edge section of the charging opening of said tab-type feeder on the side closer to the drive unit in the traveling direction toward an edge section in the lateral direction perpendicular to the traveling direction.
 13. The movable wood crushing machine according to claim 12, wherein an operation panel for driving and operating various devices including said drive unit is provided on a side face in the lateral direction perpendicular to the traveling direction of said vehicle body; a cooling air inlet section for said drive unit is formed on the side face with the operation panel provided thereon; and this cooling air inlet section is covered with a covering device allowing visual check of clogging on the surface thereof.
 14. The movable wood crushing machine according to claim 2, wherein an operation panel for driving and operating various devices including said drive unit is provided on a side face in the lateral direction perpendicular to the traveling direction of said vehicle body; a cooling air inlet section for said drive unit is formed on the side face with the operation panel provided thereon; and this cooling air inlet section is covered with a covering device allowing visual check of clogging on the surface thereof.
 15. The movable wood crushing machine according to claim 3, wherein an operation panel for driving and operating various devices including said drive unit is provided on a side face in the lateral direction perpendicular to the traveling direction of said vehicle body; a cooling air inlet section for said drive unit is formed on the side face with the operation panel provided thereon; and this cooling air inlet section is covered with a covering device allowing visual check of clogging on the surface thereof.
 16. The movable wood crushing machine according to claim 4, wherein an operation panel for driving and operating various devices including said drive unit is provided on a side face in the lateral direction perpendicular to the traveling direction of said vehicle body; a cooling air inlet section for said drive unit is formed on the side face with the operation panel provided thereon; and this cooling air inlet section is covered with a covering device allowing visual check of clogging on the surface thereof.
 17. The movable wood crushing machine according to claim 2, wherein said vehicle body is provided with a swinging mechanism for swinging said tab-type feeder toward end of said vehicle body in the traveling direction.
 18. The movable wood crushing machine according to claim 3, wherein said vehicle body is provided with a swinging mechanism for swinging said tab-type feeder toward end of said vehicle body in the traveling direction.
 19. The movable wood crushing machine according to claim 17, wherein said swinging mechanism has a coupling shaft swingably bearing said tab-type feeder on said vehicle body; and when said tab-type feeder is in a posture for working, the horizontal distance from the center of said coupling shaft to an edge section of said tab-type feeder on the side closer to said drive unit along the traveling direction of said vehicle body is shorter than the vertical distance from the center of said coupling shaft to the highest part of said tab-type feeder.
 20. The movable wood crushing machine according to claim 18, wherein said swinging mechanism has a coupling shaft swingably bearing said tab-type feeder on said vehicle body; and when said tab-type feeder is in a posture for working, the horizontal distance from the center of said coupling shaft to an edge section of said tab-type feeder on the side closer to said drive unit along the traveling direction of said vehicle body is shorter than the vertical distance from the center of said coupling shaft to the highest part of said tab-type feeder.
 21. The movable wood crushing machine according to claim 20, wherein when said tab-type feeder is in a posture for working, the horizontal distance from the center of said coupling shaft to an edge section of said tab-type feeder on the contrary side from said drive unit along the traveling direction of said vehicle body is shorter than the vertical direction from the center of said coupling shaft to a position of said travel device contacting the ground surface.
 22. The movable wood crushing machine according to claim 19, wherein when said tab-type feeder is in a posture for working, the horizontal distance from the center of said coupling shaft to an edge section of said tab-type feeder on the contrary side from said drive unit along the traveling direction of said vehicle body is shorter than the vertical direction from the center of said coupling shaft to a position of said travel device contacting the ground surface.
 23. The movable wood crushing machine according to claim 6, wherein said tab-type feeder comprises: a base plate fixed on said vehicle body; a rotary tab rotatably provided on this base plate; and a hopper provided in the upper part of the rotary tab and supported by a column erected from said base plate.
 24. The movable wood crushing machine according to claim 7, wherein said tab-type feeder comprises: a base plate fixed on said vehicle body; a rotary tab rotatably provided on this base plate; and a hopper provided in the upper part of the rotary tab and supported by a column erected from said base plate.
 25. The movable wood crushing machine according to claim 7, wherein said swinging mechanism has a swinging restricting section for inhibiting a swinging movement of said tab-type feeder up to a position causing interference to said travel device when said tab-type feeder is swung around said coupling shaft.
 26. The movable wood crushing machine according to claim 8, wherein said swinging mechanism has a swinging restricting section for inhibiting a swinging movement of said tab-type feeder up to a position causing interference to said travel device when said tab-type feeder is swung around said coupling shaft.
 27. The movable wood crushing machine according to claim 9, wherein said swinging mechanism has a swinging restricting section for inhibiting a swinging movement of said tab-type feeder up to a position causing interference to said travel device when said tab-type feeder is swung around said coupling shaft.
 28. The wood crushing machine according to claim 2, wherein a screen member allowing passing through only the wood chips crushed by said rotary crushing device having a prespecified size or below is provided between said rotary crushing device and said conveyer; and this screen member is provided around a rotary shaft of said rotary crushing device to surround said rotary crushing device with an upper edge thereof provided at a position higher than the rotary shaft of said rotary crushing device when viewed from a position of said rotary shaft.
 29. The wood crushing machine according to claim 3, wherein a screen member allowing passing through only the wood chips crushed by said rotary crushing device having a prespecified size or below is provided between said rotary crushing device and said conveyer; and this screen member is provided around a rotary shaft of said rotary crushing device to surround said rotary crushing device with an upper edge thereof provided at a position higher than the rotary shaft of said rotary crushing device when viewed from a position of said rotary shaft. 